CVE-2026-53948: Ghost is a Node.js content management system. From 6.19.4 until 6.21.1, insufficient validation of the client-supplied Content-Type on Ghost's Admin API file…

PriorityP429medium5.4CVSS 3.1

AVNACLPRLUIRSCCLILAN

EPSS

0.13%

3.2th percentile

Ghost is a Node.js content management system. From 6.19.4 until 6.21.1, insufficient validation of the client-supplied Content-Type on Ghost's Admin API file upload endpoint allowed uploaded files to be served from the site with an attacker-chosen content type on S3/GCS storage backends. On installations that serve uploaded files from the same origin as the site, this could have been used to facilitate stored cross-site scripting against site visitors or staff. This vulnerability is fixed in 6.21.1.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
tryghost	ghost	—	—

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